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Finding the Fourth Proportional to 391,416.48, 540,154.71 and 221,683.41

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Solution

The fourth proportional to 391,416.48, 540,154.71 and 221,683.41 is: 305,923.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,416.48 : 540,154.71 = 221,683.41 : x
  2. Step 2: Convert to fraction form
    391,416.48/540,154.71 = 221,683.41/x
  3. Step 3: Cross multiply
    391,416.48x = 540,154.71 × 221,683.41
  4. Step 4: Simplify right side
    391,416.48x = 119,743,338,040.36
  5. Step 5: Solve for x
    x = 119,743,338,040.36/391,416.48
  6. Step 6: Final answer
    x = 305,923.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.